CaltechAUTHORS
Published November 1990 | Published
Book Section - Chapter Open

An Analog VLSI Chip for Finding Edges from Zero-crossings

Bair, Wyeth
Koch, Christof ORCID icon
Others:
Lippmann, Richard P.
Moody, John E.
Touretzky, David S.
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Abstract

We have designed and tested a one-dimensional 64 pixel, analog CMOS VLSI chip which localizes intensity edges in real-time. This device exploits on-chip photoreceptors and the natural filtering properties of resistive net(cid:173) works to implement a scheme similar to and motivated by the Difference of Gaussians (DOG) operator proposed by Marr and Hildreth (1980). Our chip computes the zero-crossings associated with the difference of two exponential weighting functions. If the derivative across this zero-crossing is above a threshold, an edge is reported. Simulations indicate that this technique will extend well to two dimensions.

Additional Information

Many thanks to Carver Mead. Our laboratory is partially supported by grants from the Office of Naval Research, the Rockwell International Science Center and the Hughes Aircraft Artificial Intelligence Center. Wyeth Bair is supported by a National Science Foundation Graduate Fellowship. Thanks also to Steve DeWeerth and John Harris.

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Published - NIPS-1990-an-analog-vlsi-chip-for-finding-edges-from-zero-crossings-Paper.pdf

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NIPS-1990-an-analog-vlsi-chip-for-finding-edges-from-zero-crossings-Paper.pdf

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